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Find all the structural isomer of C4H6

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Total unsaturation of C4H6 = 2 

Possibility = one triple bond, or 2 double bond or (one ring + one double bond) 

Possibility for triple bond

Possibility for two double bonds

Possible cyclic structures: 

Total structural isomers = 4(acyclic) + 5(cyclic) = 9

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